added fps limit

src/Game.cpp

@@ -43,11 +43,19 @@ Game::Game(SDL_Window *window, SDL_Renderer *renderer)
 
 void Game::Run()
 {
-	float deltaTime = (SDL_GetTicks() - m_TickCount) / 1000.0f;
+    uint64_t currentTicksNS = SDL_GetTicksNS();
-    uint64_t ticks = SDL_GetTicks() - m_TickCount;
+    uint64_t frameTicks = currentTicksNS - m_TickCount;
-    ticks = ticks > 0 ? ticks : 1;
+    if(frameTicks < m_MinTicksPerFrame)
-    int fps = 1000/(ticks);
+    {
-	m_TickCount = SDL_GetTicks();
+        SDL_DelayNS(m_MinTicksPerFrame - frameTicks);
+        currentTicksNS = SDL_GetTicksNS();
+        frameTicks = currentTicksNS - m_TickCount;
+    }
+	float deltaTime = frameTicks / c_NSPerSecond;
+	m_TickCount = currentTicksNS;
+    long fps = 1/deltaTime;
+
+
     HandleMovement();
     m_Player1->Update(deltaTime);
 

src/Game.h

@@ -24,9 +24,12 @@ public:
     void EndGame();
 private:
     const float c_GamepadAxisDeadzone = 0.2; //TODO: make this a setting?
+    const float c_NSPerSecond = 1000000000;
 
     bool m_running = true;
     uint64_t m_TickCount;
+    uint64_t m_MinTicksPerFrame = c_NSPerSecond/60;
+
     std::map<SDL_Scancode, GameCommand*> m_KeyboardCommandMap;
     std::map<SDL_GamepadButton, GameCommand*> m_Gamepad1ButtonCommandMap;
     std::map<SDL_GamepadButton, GameCommand*> m_Gamepad2ButtonCommandMap;